Stop-valve.



No. 660,349. Patented Oct. 23, [900. A. TUBNBULL.

S TU P V A L V E.

(Application filed July 24, 1900.)

(No Model.) 2 Sheets-Sheet l.

Patented Oct. 23, I900. A. TURNBULL.

STOP VALVE.

(Application filed July 24, 1900.)

I (No Model.)

- 2 Sheets-Sheet 2.

Has;-

UNITED STATES PATENT OFFICE.

ALEXANDER TURNBULL, OF BISHOPBRIGGS, SCOTLAND.

STO P-VALVE.

SPECIFICATION forming part of Letters Patent No. 660,349, dated October 23, 1900.

Application filed July 24, 1900. Serial No. 24,702. (No model.)

To ctZZ whom) it may concern:

Be it known that I, ALEXANDER TURNBULL,

a citizen of the United Kingdom of Great Britain and Ireland, residing at St. Mungo Works, Bishopbriggs, in the county of Lanark, Scotland, have invented certain new and useful Improvements in Stop-Valves, (for which application for patent has been made in Great Britain, No. 586, dated January 10, 1900,) of which the following is a specification.

This invention relates to stopvalves or sluice-valves for steam, water, air, or gas pipes or casings, wherein sliding face-plates or wedge-blocks are fitted to cover the inlet and outlet on opposite sides of the valve-casing and are raised or lowered by means of aspindle and pressed against their seats by wedge action; and the present improvements have for their object, besides simplifying the construction and lessening the cost of such valves, to render them more durable and efficient byproviding means whereby the closing pressure of the face-plates or wedge-blocks is relieved while the valve is being raised and lowered to open or close the passage through the pipe or casing.

The invention is illustrated by the accompanying drawings.

Figure 1 is a. sectional elevation of a stopvalve, and Fig. 2 a similar elevation at right angles to Fig. 1. Figs. 3, 4, and 5 are vertical sections of the lower part of the valve, showing three different methods of attaching the valve face-plates to the actuating-spindle.

The valve-faces'are formed by a hollow block slit or divided in a diagonal or inclined line or of two Wedge-blocks A B, which are preferably hollowed or cored out internally and have parallel or slightly-inclined outer faces A B to fit the seats 0, formed over the inlet D and outlet E of the valve-casing F, while their rear or meeting faces are inclined, as at A so that when moved vertically one over the other they act as Wedges and are spread in a lateral direction to press against their seats 0.

The valve-blocks A B are fitted between a collar G and nut H on the valve-spindle I, as shown at Figs. 1, 2, and 5, or on the end of the spindle in either of the fashions shown at Figs. 3 or 4, and are either raised or lowered bodily therewith, as shown at Figs. 1, 2, 3,

and 5, or fitted as a nut upon a screw-thread ed portion of the spindle I, so as to be raised and lowered by turning the spindle, as shown at Fig. 4. The two blocks or halves A B of the valve are pressed apart, preferably in the line of the spindle I, by means of a helical or other spring J, which bears on the upper portion of one and on the lowerportion of the other block and by tending to separate the parts A B of the valve in the direction of their length lessens their width across the valvefaces A B, so that the valve may be freely raised and lowered without unduly wearing the faces or seats 0. Instead of using a central spring, as shown, tWo springs may be employed, situated outside the hollow block and acting between lugs on the parts of said block. While the spindle I is being screwed down, as at Figs. 1, 2, 3, and 5, or turned, as at Fig. 4, to close the valve, the collar G or the end of the spindle I by pressing endwise on one of the blocks A would tend to spread the valve faces A B before the final closing of the valve upon the seats 0; but this action is prevented by the springJ until the block B comes to rest upon the stops X on the easing F. On fully screwing down the spindle I the pressure of the spring J is overcome and the valve-faces A B fully spread apart to closely fit the valve-seats C, while on starting to raise the valve the earlier turns of the spindle first lift away the block A, thus separating the blocks AB in the direction of the spindle, the springJassistingin the same direction, until the not H is drawn up against the block B, which is thereafter lifted by it.

Having now described the invention, what I claim, and desire to secure by Letters Patent, is

1. A sluice or stop valve composed of two separate wedge-blocks having inclined meetin g faces and parallel or approximately-parallel acting faces, a valve spindle or bolt upon which the blocks are strung in proximity to each other, means consisting of collars or the like by which the upper block is secured to and caused to move with the spindle so that during the closing action the blocks may be forced against their respective valve-seats, and a collar on the lower end of the spindle or bolt so placed that during the opening movement the blocks are allowed to spread apart in the line of the spindle so as to relieve the pressure upon the valve-faces when the closing pressure upon the blocks is relieved. 2. In a sluice or stop valve the combination with two separate wedge-blocks having their I acting faces parallel or approximately so, and their meeting faces inclined, of a spring or springs situated between the blocks and adapted to spread them apart in the line of the spindle so as to relieve the pressure upon the valve-faces when the closing pressure upon the blocks is relieved.

In Witness whereof Ihave hereunto set my hand in presence of two witnesses.

ALEXANDER TURNBULL. Witnesses:

WALLACE FAIRWEATHER, J NO. ARMSTRONG, J 1-. 

